how much BTC would it take to pop the bubble
Assuming the bubble counts as "pop" when we go beneath $200 (people will say it is even though we were just there a day ago), it takes exactly 11,846 Bitcoins to pop the bubble.
80%
Oh, ouch. Okay, lets see:
0.2*231 = 46.2...
88,721 BTC to pop the bubble.